Creating a civ is pretty hard and time consuming. I've yet to make one myself, but I'm working on right now. It takes a lot of patience. I recommend you try to familiarize yourself with ModBuddy before getting started. The easiest way, I think, is to copy and paste a civilization and change it bit by bit into the civilization you want to make. Guide here: http://forums.civfanatics.com/showthread.php?t=490901